Note: I am assuming that the compressor cycles off/on and everything else looks/sounds normal.
Check the freezer temperature. Should be around 0 to 5 degrees F.
If it is lower then the main thermostat may be shot or you may be able to just set the main thermostat to a warmer temperature.

If freezer temperature is OK, check the fresh food side temperature should be around 40 degrees F.
Check that the damper (Item 11 in Section 4) opens and closes with adjusting the fresh food temperature setting. This is what regulates the amount of cold air entering the fresh food section.

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